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## org.bouncycastle.crypto.engines
Class SerpentEngine

    java.lang.Object
      org.bouncycastle.crypto.engines.SerpentEngineBase
          org.bouncycastle.crypto.engines.SerpentEngine

All Implemented Interfaces:
  BlockCipher

public final class SerpentEngine
extends SerpentEngineBase

Serpent is a 128-bit 32-round block cipher with variable key lengths, including 128, 192 and 256 bit keys conjectured to be at least as secure as three-key triple-DES.

Serpent was designed by Ross Anderson, Eli Biham and Lars Knudsen as a candidate algorithm for the NIST AES Quest.

For full details see The Serpent home page

Field Summary

Fields inherited from class org.bouncycastle.crypto.engines.SerpentEngineBase
`BLOCK_SIZE, encrypting, keyBits, wKey`

Constructor Summary
`SerpentEngine()`

Method Summary
`protected void` | `decryptBlock(byte[] input, int inOff, byte[] output, int outOff)` Decrypt one block of ciphertext.
`protected void` | `encryptBlock(byte[] input, int inOff, byte[] output, int outOff)` Encrypt one block of plaintext.
`protected int[]` | `makeWorkingKey(byte[] key)` Expand a user-supplied key material into a session key.

Methods inherited from class org.bouncycastle.crypto.engines.SerpentEngineBase
`getAlgorithmName, getBlockSize, ib0, ib1, ib2, ib3, ib4, ib5, ib6, ib7, init, inverseLT, LT, processBlock, reset, rotateLeft, rotateRight, sb0, sb1, sb2, sb3, sb4, sb5, sb6, sb7`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SerpentEngine

    public SerpentEngine()

Method Detail

### makeWorkingKey

    protected int[] makeWorkingKey(byte[] key)
                            throws java.lang.IllegalArgumentException

  Expand a user-supplied key material into a session key.

  Specified by:
    `makeWorkingKey` in class `SerpentEngineBase`
  Parameters:
    `key` - The user-key bytes (multiples of 4) to use.
  Throws:
    `java.lang.IllegalArgumentException`

### encryptBlock

    protected void encryptBlock(byte[] input,
                                int inOff,
                                byte[] output,
                                int outOff)

  Encrypt one block of plaintext.

  Specified by:
    `encryptBlock` in class `SerpentEngineBase`
  Parameters:
    `input` - the array containing the input data.
    `inOff` - offset into the in array the data starts at.
    `output` - the array the output data will be copied into.
    `outOff` - the offset into the out array the output will start at.

### decryptBlock

    protected void decryptBlock(byte[] input,
                                int inOff,
                                byte[] output,
                                int outOff)

  Decrypt one block of ciphertext.

  Specified by:
    `decryptBlock` in class `SerpentEngineBase`
  Parameters:
    `input` - the array containing the input data.
    `inOff` - offset into the in array the data starts at.
    `output` - the array the output data will be copied into.
    `outOff` - the offset into the out array the output will start at.

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